Please explain the carbon cycle and how us humans, recycle it. Be specific to explain where carbon is initially found and how it is cycled back to the same initial place

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

Which would be the most useful source of evidence to support mcneill's contention?

Which enzymes break down carbohydrates?